single dentures Flashcards
What is the definition of a single complete denture? ==
A denture constructed for either the maxillary or mandibular ridge to oppose a dentulous or partially edentulous arch.
What are the challenges of mandibular single dentures? ==
Smaller denture-bearing area, porous cancellous ridge, faster resorption, and reduced tolerance to occlusal stresses.
How are remaining teeth used as overdenture abutments and why?==
To retain and reduce them in contour and height for overdenture support instead of extraction.
What are the benefits of implant-supported overdentures? ==
They provide better support and stability for lower single dentures.
Why is lining lower single dentures with a resilient permanent soft liner recommended? ==
To provide cushioning and adapt better to the tissues, reducing stress.
When might extraction of maxillary teeth be considered in mandibular single denture cases? ==
When opposing natural teeth or partial dentures cause excessive occlusal stress.
Why are maxillary single dentures preferred over mandibular ones? ==
Due to the larger denture-bearing area and better tissue support.
What problem arises from the excessive forces of opposing natural teeth in maxillary single dentures? ==
Rapid resorption of the residual ridge and the formation of flabby tissues.
How can you reduce the impact of excessive forces on maxillary single dentures? ==
By maximizing denture base extension to distribute forces over a larger area.
What causes frequent fractures in maxillary single dentures? ==
Excessive pressure from opposing natural teeth.
How can fractures in maxillary single dentures be prevented? ==
Using a strong metal base to withstand the applied forces.
How do tilted or malposed teeth affect maxillary single dentures? ==
They create an irregular occlusal plane, causing horizontal forces that destabilize the denture.
What treatment can address mildly tilted posterior teeth? ==
Selective grinding of the teeth to reshape them.
What is the treatment for severely tilted teeth in maxillary single denture cases? ==
Extraction or orthodontic repositioning.
How does deep bite from over-erupted lower anterior teeth affect upper dentures? ==
It can lead to improper occlusion and a steep incisal angle.
What adjustment is necessary for the wax rim in cases of over-erupted lower anterior teeth? ==
Wax should be removed palatally to allow proper contact between the teeth and the wax rim.
Why is occlusal adjustment necessary before single denture construction? ==
To control the horizontal forces that affect denture stability and occlusal plane.
What is the first step in the first technique for occlusal adjustment? ==
Mounting upper and lower casts on the articulator using a centric relation record.
What is the purpose of marking occlusal interferences in the first technique? ==
To guide the occlusal adjustment both on the cast and in the patient’s mouth.
How is a U-shaped metal occlusal template used in the second technique? ==
It is placed on the lower cast to identify over-erupted cusps that require reduction.
How does the second technique transfer changes to the patient’s mouth? ==
By reducing over-erupted cusps on the cast and then performing the same adjustments in the patient’s mouth.
What is the clear acrylic resin template used for in the third technique? ==
To mark occlusal interferences on the natural teeth by coating it with pressure-indicating paste.
How is the occlusal adjustment completed in the third technique? ==
By grinding the natural teeth based on the markings from the template until it seats properly
How is the selection of posterior teeth determined for a single denture? ==
It is based on the occlusal form of the natural posterior teeth.
When are non-anatomic teeth used in single dentures? ==
When natural cusps are worn or reduced during occlusal adjustment.
What are the advantages of acrylic teeth in single dentures? ==
Acrylic teeth are easily adjusted during occlusal modifications and do not wear down opposing natural teeth.
What is IPN resin and why is it used for single dentures? ==
IPN resin is a highly cross-linked polymer with greater wear resistance than conventional acrylic resin.
Why are porcelain teeth not recommended for single dentures? ==
Porcelain teeth are prone to fracture during occlusal adjustment and do not mark well with articulating paper.
What are acrylic resin teeth with gold occlusal surfaces used for? ==
They provide the best material for artificial occlusion that opposes natural teeth, as gold is durable and maintains occlusal stability.
How are amalgam stops used in acrylic resin teeth? ==
Amalgam is inserted into the occlusal surfaces of acrylic teeth to reduce wear and simulate the patient’s jaw movements for balanced occlusion.
What is combination syndrome (Kelly’s syndrome)? ==
It is an oral condition that occurs when an edentulous maxilla opposes natural mandibular anterior teeth, leading to bone loss and other complications.
How can combination syndrome be prevented or treated? ==
It can be prevented with proper occlusal adjustments, balanced dentures, and sometimes by placing implants or using overdentures.
What is the simplest method to adjust the occlusal plane of natural teeth before constructing a single denture? ==
Selective grinding of malposed teeth.
What is the name of the syndrome caused by long-term use of a mandibular distal extension partial denture against a complete maxillary denture? ==
Kelly’s syndrome.
What are alternative treatments for severely malposed teeth in single denture cases? ==
Crowning, extraction, or orthodontic treatment.
